Final answer:
Hyper-threading is when logical cores appear as physical cores to an operating system, improving multitasking and performance in multithreaded applications.
Step-by-step explanation:
When logical cores appear as real physical cores to an operating system, it is called hyper-threading. Hyper-threading is a technology used by Intel processors to improve performance by allowing multiple threads to use the same physical core.
For example, a quad-core processor with hyper-threading would appear as an eight-core processor to the operating system. This allows for better multitasking and can improve performance in multithreaded applications.
Hyper-threading is commonly used in high-end desktops, workstations, and servers.